文件数据结构分析

文件头从0x0地址开始 是一个uint_64_t，表示在data01.arc里有多少个文件

The issue describes a file header starting at address 0x0 with a uint64_t indicating the number of files in data01.arc. Start by examining the existing extraction code to understand the current parsing logic. Look for where file headers are read and how the file count is used. Determine if the documentation needs to be updated in a README, source code comments, or a separate specification file.

Escrita pelo modelo de indexação a partir do texto da issue.